Which of the following is not a reason why actual yield is less than theoretical yield? A. presence of impure reactants

B. conservation of mass

C. competing side reactions

D. loss of product during purification

Your answer is B, conservation of mass

Recall that percent yield is given by: %Yeild = actual yeild/theoretical yeild x100

During experiments, there are errors made:

• uncertainty in measurements

• losses of reactants and products

• impurity in reactants

• losses during separation (e.g. filtration or purification)

• Some side reactions might also happen.

Among the given options, only conservation of mass does not contribute to a lower actual yield compared to the theoretical yield.

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